Note 13 - Financial Instruments With Off-balance Sheet Risk - Financial Instruments Outstanding Representing Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commitments to Extend Credit [Member]
Off balance sheet liability, amount	$ 158,859	$ 145,635
Standby Letters of Credit 1 [Member]
Off balance sheet liability, amount	15,212	16,092
Interest Rate Lock Commitments [Member]
Off balance sheet liability, amount	$ 20,496	$ 13,013